Quote:
Originally Posted by old_coot88
There's a quick & dirty way of measuring 'Gravel Gerties' of unknown value.  Crack it in two at the halfway point and measure the side that still has continuity, and multiply by two.
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Great tip !! 40yrs in the biz & I never heard it. I tip
my hat 2 U.
Oh BTW we called them bricks up here.....
73 Zeno